"""distutils.util
Miscellaneous utility functions -- anything that doesn't fit into
one of the other *util.py modules.
"""
from __future__ import annotations
import functools
import importlib.util
import os
import pathlib
import re
import string
import subprocess
import sys
import sysconfig
import tempfile
from collections.abc import Callable, Iterable, Mapping
from typing import TYPE_CHECKING, AnyStr
from jaraco.functools import pass_none
from ._log import log
from ._modified import newer
from .errors import DistutilsByteCompileError, DistutilsPlatformError
from .spawn import spawn
if TYPE_CHECKING:
from typing_extensions import TypeVarTuple, Unpack
_Ts = TypeVarTuple("_Ts")
def get_host_platform() -> str:
"""
Return a string that identifies the current platform. Use this
function to distinguish platform-specific build directories and
platform-specific built distributions.
"""
# This function initially exposed platforms as defined in Python 3.9
# even with older Python versions when distutils was split out.
# Now it delegates to stdlib sysconfig.
return sysconfig.get_platform()
def get_platform() -> str:
if os.name == 'nt':
TARGET_TO_PLAT = {
'x86': 'win32',
'x64': 'win-amd64',
'arm': 'win-arm32',
'arm64': 'win-arm64',
}
target = os.environ.get('VSCMD_ARG_TGT_ARCH')
return TARGET_TO_PLAT.get(target) or get_host_platform()
return get_host_platform()
if sys.platform == 'darwin':
_syscfg_macosx_ver = None # cache the version pulled from sysconfig
MACOSX_VERSION_VAR = 'MACOSX_DEPLOYMENT_TARGET'
def _clear_cached_macosx_ver():
"""For testing only. Do not call."""
global _syscfg_macosx_ver
_syscfg_macosx_ver = None
def get_macosx_target_ver_from_syscfg():
"""Get the version of macOS latched in the Python interpreter configuration.
Returns the version as a string or None if can't obtain one. Cached."""
global _syscfg_macosx_ver
if _syscfg_macosx_ver is None:
from distutils import sysconfig
ver = sysconfig.get_config_var(MACOSX_VERSION_VAR) or ''
if ver:
_syscfg_macosx_ver = ver
return _syscfg_macosx_ver
def get_macosx_target_ver():
"""Return the version of macOS for which we are building.
The target version defaults to the version in sysconfig latched at time
the Python interpreter was built, unless overridden by an environment
variable. If neither source has a value, then None is returned"""
syscfg_ver = get_macosx_target_ver_from_syscfg()
env_ver = os.environ.get(MACOSX_VERSION_VAR)
if env_ver:
# Validate overridden version against sysconfig version, if have both.
# Ensure that the deployment target of the build process is not less
# than 10.3 if the interpreter was built for 10.3 or later. This
# ensures extension modules are built with correct compatibility
# values, specifically LDSHARED which can use
# '-undefined dynamic_lookup' which only works on >= 10.3.
if (
syscfg_ver
and split_version(syscfg_ver) >= [10, 3]
and split_version(env_ver) < [10, 3]
):
my_msg = (
'$' + MACOSX_VERSION_VAR + ' mismatch: '
f'now "{env_ver}" but "{syscfg_ver}" during configure; '
'must use 10.3 or later'
)
raise DistutilsPlatformError(my_msg)
return env_ver
return syscfg_ver
def split_version(s: str) -> list[int]:
"""Convert a dot-separated string into a list of numbers for comparisons"""
return [int(n) for n in s.split('.')]
@pass_none
def convert_path(pathname: str | os.PathLike[str]) -> str:
r"""
Allow for pathlib.Path inputs, coax to a native path string.
If None is passed, will just pass it through as
Setuptools relies on this behavior.
>>> convert_path(None) is None
True
Removes empty paths.
>>> convert_path('foo/./bar').replace('\\', '/')
'foo/bar'
"""
return os.fspath(pathlib.PurePath(pathname))
def change_root(
new_root: AnyStr | os.PathLike[AnyStr], pathname: AnyStr | os.PathLike[AnyStr]
) -> AnyStr:
"""Return 'pathname' with 'new_root' prepended. If 'pathname' is
relative, this is equivalent to "os.path.join(new_root,pathname)".
Otherwise, it requires making 'pathname' relative and then joining the
two, which is tricky on DOS/Windows and Mac OS.
"""
if os.name == 'posix':
if not os.path.isabs(pathname):
return os.path.join(new_root, pathname)
else:
return os.path.join(new_root, pathname[1:])
elif os.name == 'nt':
(drive, path) = os.path.splitdrive(pathname)
if path[0] == os.sep:
path = path[1:]
return os.path.join(new_root, path)
raise DistutilsPlatformError(f"nothing known about platform '{os.name}'")
@functools.lru_cache
def check_environ() -> None:
"""Ensure that 'os.environ' has all the environment variables we
guarantee that users can use in config files, command-line options,
etc. Currently this includes:
HOME - user's home directory (Unix only)
PLAT - description of the current platform, including hardware
and OS (see 'get_platform()')
"""
if os.name == 'posix' and 'HOME' not in os.environ:
try:
import pwd
os.environ['HOME'] = pwd.getpwuid(os.getuid())[5]
except (ImportError, KeyError):
# bpo-10496: if the current user identifier doesn't exist in the
# password database, do nothing
pass
if 'PLAT' not in os.environ:
os.environ['PLAT'] = get_platform()
def subst_vars(s, local_vars: Mapping[str, object]) -> str:
"""
Perform variable substitution on 'string'.
Variables are indicated by format-style braces ("{var}").
Variable is substituted by the value found in the 'local_vars'
dictionary or in 'os.environ' if it's not in 'local_vars'.
'os.environ' is first checked/augmented to guarantee that it contains
certain values: see 'check_environ()'. Raise ValueError for any
variables not found in either 'local_vars' or 'os.environ'.
"""
check_environ()
lookup = dict(os.environ)
lookup.update((name, str(value)) for name, value in local_vars.items())
try:
return _subst_compat(s).format_map(lookup)
except KeyError as var:
raise ValueError(f"invalid variable {var}")
def _subst_compat(s):
"""
Replace shell/Perl-style variable substitution with
format-style. For compatibility.
"""
def _subst(match):
return f'{{{match.group(1)}}}'
repl = re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s)
if repl != s:
import warnings
warnings.warn(
"shell/Perl-style substitutions are deprecated",
DeprecationWarning,
)
return repl
def grok_environment_error(exc: object, prefix: str = "error: ") -> str:
# Function kept for backward compatibility.
# Used to try clever things with EnvironmentErrors,
# but nowadays str(exception) produces good messages.
return prefix + str(exc)
# Needed by 'split_quoted()'
_wordchars_re = _squote_re = _dquote_re = None
def _init_regex():
global _wordchars_re, _squote_re, _dquote_re
_wordchars_re = re.compile(rf'[^\\\'\"{string.whitespace} ]*')
_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
def split_quoted(s: str) -> list[str]:
"""Split a string up according to Unix shell-like rules for quotes and
backslashes. In short: words are delimited by spaces, as long as those
spaces are not escaped by a backslash, or inside a quoted string.
Single and double quotes are equivalent, and the quote characters can
be backslash-escaped. The backslash is stripped from any two-character
escape sequence, leaving only the escaped character. The quote
characters are stripped from any quoted string. Returns a list of
words.
"""
# This is a nice algorithm for splitting up a single string, since it
# doesn't require character-by-character examination. It was a little
# bit of a brain-bender to get it working right, though...
if _wordchars_re is None:
_init_regex()
s = s.strip()
words = []
pos = 0
while s:
m = _wordchars_re.match(s, pos)
end = m.end()
if end == len(s):
words.append(s[:end])
break
if s[end] in string.whitespace:
# unescaped, unquoted whitespace: now
# we definitely have a word delimiter
words.append(s[:end])
s = s[end:].lstrip()
pos = 0
elif s[end] == '\\':
# preserve whatever is being escaped;
# will become part of the current word
s = s[:end] + s[end + 1 :]
pos = end + 1
else:
if s[end] == "'": # slurp singly-quoted string
m = _squote_re.match(s, end)
elif s[end] == '"': # slurp doubly-quoted string
m = _dquote_re.match(s, end)
else:
raise RuntimeError(f"this can't happen (bad char '{s[end]}')")
if m is None:
raise ValueError(f"bad string (mismatched {s[end]} quotes?)")
(beg, end) = m.span()
s = s[:beg] + s[beg + 1 : end - 1] + s[end:]
pos = m.end() - 2
if pos >= len(s):
words.append(s)
break
return words
# split_quoted ()
def execute(
func: Callable[[Unpack[_Ts]], object],
args: tuple[Unpack[_Ts]],
msg: object = None,
verbose: bool = False,
) -> None:
"""
Perform some action that affects the outside world (e.g. by
writing to the filesystem). Was previously used to deal with
"dry run" operations, but now runs unconditionally.
"""
if msg is None:
msg = f"{func.__name__}{args!r}"
if msg[-2:] == ',)': # correct for singleton tuple
msg = msg[0:-2] + ')'
log.info(msg)
func(*args)
def strtobool(val: str) -> bool:
"""Convert a string representation of truth to true (1) or false (0).
True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
'val' is anything else.
"""
val = val.lower()
if val in ('y', 'yes', 't', 'true', 'on', '1'):
return True
elif val in ('n', 'no', 'f', 'false', 'off', '0'):
return False
else:
raise ValueError(f"invalid truth value {val!r}")
def byte_compile( # noqa: C901
py_files: Iterable[str],
optimize: int = 0,
force: bool = False,
prefix: str | None = None,
base_dir: str | None = None,
verbose: bool = True,
direct: bool | None = None,
) -> None:
"""Byte-compile a collection of Python source files to .pyc
files in a __pycache__ subdirectory. 'py_files' is a list
of files to compile; any files that don't end in ".py" are silently
skipped. 'optimize' must be one of the following:
0 - don't optimize
1 - normal optimization (like "python -O")
2 - extra optimization (like "python -OO")
If 'force' is true, all files are recompiled regardless of
timestamps.
The source filename encoded in each bytecode file defaults to the
filenames listed in 'py_files'; you can modify these with 'prefix' and
'basedir'. 'prefix' is a string that will be stripped off of each
source filename, and 'base_dir' is a directory name that will be
prepended (after 'prefix' is stripped). You can supply either or both
(or neither) of 'prefix' and 'base_dir', as you wish.
Byte-compilation is either done directly in this interpreter process
with the standard py_compile module, or indirectly by writing a
temporary script and executing it. Normally, you should let
'byte_compile()' figure out to use direct compilation or not (see
the source for details). The 'direct' flag is used by the script
generated in indirect mode; unless you know what you're doing, leave
it set to None.
"""
# nothing is done if sys.dont_write_bytecode is True
if sys.dont_write_bytecode:
raise DistutilsByteCompileError('byte-compiling is disabled.')
# First, if the caller didn't force us into direct or indirect mode,
# figure out which mode we should be in. We take a conservative
# approach: choose direct mode *only* if the current interpreter is
# in debug mode and optimize is 0. If we're not in debug mode (-O
# or -OO), we don't know which level of optimization this
# interpreter is running with, so we can't do direct
# byte-compilation and be certain that it's the right thing. Thus,
# always compile indirectly if the current interpreter is in either
# optimize mode, or if either optimization level was requested by
# the caller.
if direct is None:
direct = __debug__ and optimize == 0
# "Indirect" byte-compilation: write a temporary script and then
# run it with the appropriate flags.
if not direct:
(script_fd, script_name) = tempfile.mkstemp(".py")
log.info("writing byte-compilation script '%s'", script_name)
script = os.fdopen(script_fd, "w", encoding='utf-8')
with script:
script.write(
"""\
from distutils.util import byte_compile
files = [
"""
)
# XXX would be nice to write absolute filenames, just for
# safety's sake (script should be more robust in the face of
# chdir'ing before running it). But this requires abspath'ing
# 'prefix' as well, and that breaks the hack in build_lib's
# 'byte_compile()' method that carefully tacks on a trailing
# slash (os.sep really) to make sure the prefix here is "just
# right". This whole prefix business is rather delicate -- the
# problem is that it's really a directory, but I'm treating it
# as a dumb string, so trailing slashes and so forth matter.
script.write(",\n".join(map(repr, py_files)) + "]\n")
script.write(
f"""
byte_compile(files, optimize={optimize!r}, force={force!r},
prefix={prefix!r}, base_dir={base_dir!r},
verbose={verbose!r},
direct=True)
"""
)
cmd = [sys.executable]
cmd.extend(subprocess._optim_args_from_interpreter_flags())
cmd.append(script_name)
spawn(cmd)
execute(os.remove, (script_name,), f"removing {script_name}")
# "Direct" byte-compilation: use the py_compile module to compile
# right here, right now. Note that the script generated in indirect
# mode simply calls 'byte_compile()' in direct mode, a weird sort of
# cross-process recursion. Hey, it works!
else:
from py_compile import compile
for file in py_files:
if file[-3:] != ".py":
# This lets us be lazy and not filter filenames in
# the "install_lib" command.
continue
# Terminology from the py_compile module:
# cfile - byte-compiled file
# dfile - purported source filename (same as 'file' by default)
if optimize >= 0:
opt = '' if optimize == 0 else optimize
cfile = importlib.util.cache_from_source(file, optimization=opt)
else:
cfile = importlib.util.cache_from_source(file)
dfile = file
if prefix:
if file[: len(prefix)] != prefix:
raise ValueError(
f"invalid prefix: filename {file!r} doesn't start with {prefix!r}"
)
dfile = dfile[len(prefix) :]
if base_dir:
dfile = os.path.join(base_dir, dfile)
cfile_base = os.path.basename(cfile)
if direct:
if force or newer(file, cfile):
log.info("byte-compiling %s to %s", file, cfile_base)
compile(file, cfile, dfile)
else:
log.debug("skipping byte-compilation of %s to %s", file, cfile_base)
def rfc822_escape(header: str) -> str:
"""Return a version of the string escaped for inclusion in an
RFC-822 header, by ensuring there are 8 spaces space after each newline.
"""
indent = 8 * " "
lines = header.splitlines(keepends=True)
# Emulate the behaviour of `str.split`
# (the terminal line break in `splitlines` does not result in an extra line):
ends_in_newline = lines and lines[-1].splitlines()[0] != lines[-1]
suffix = indent if ends_in_newline else ""
return indent.join(lines) + suffix
def is_mingw() -> bool:
"""Returns True if the current platform is mingw.
Python compiled with Mingw-w64 has sys.platform == 'win32' and
get_platform() starts with 'mingw'.
"""
return sys.platform == 'win32' and get_platform().startswith('mingw')
def is_freethreaded():
"""Return True if the Python interpreter is built with free threading support."""
return bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
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